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Laminated cylindrical lithium ion battery and fabrication method thereof

A technology of lithium-ion batteries and manufacturing methods, which is applied to the structural field of cylindrical lithium-ion battery cells, and can solve problems such as increased internal resistance of cells, heat export, and battery safety hazards

Active Publication Date: 2014-10-15
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This design undoubtedly creates a certain amount of invalid space at both ends of the cell, which further limits the capacity of the battery;
[0005] 3. The traditional electric core is wound. Due to the poor thermal conductivity of the diaphragm, the outer winding layer of the electric core adds multiple layers of insulation to the inner winding layer. As a result, during use, the heat generated by charging and discharging is difficult to dissipate. The battery is internally exported, so that the battery is prone to local high temperature areas; on the one hand, due to the large diameter of the battery itself, the heat is not easy to be exported quickly
On the other hand, due to the increase in the heat of the battery cell, the internal resistance of the battery cell itself increases, resulting in a large amount of electrical energy inside the battery cell being converted into heat energy, causing the battery to generate further heat.
Combining the above two reasons, it is bound to bring great safety hazards to the use of batteries, and also shorten the battery life to a certain extent, affecting the efficient performance of various performances of lithium-ion batteries.

Method used

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  • Laminated cylindrical lithium ion battery and fabrication method thereof
  • Laminated cylindrical lithium ion battery and fabrication method thereof
  • Laminated cylindrical lithium ion battery and fabrication method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Example 1 Preparation of 18650 type lithium iron phosphate cathode material battery

[0065] Positive electrode ratio: 945g LiFePO 4 +7g of PVDF (5130)+2gSuper_p+2gKS_6; using a pulper, first add 1200g of NMP, then add 7g of PVDF (5130) and stir at high speed for 3h, 2g of Super_p and 2g of KS_6 for 3h at high speed, and 945g of LiFePO 4 Stir at high speed for 4h.

[0066] The stirred positive electrode slurry is coated on the positive electrode current collector on the coating machine to obtain a single-sided surface density of 150g / m 2 , double-sided density 300g / m 2 positive pole piece. The above-mentioned coated positive electrode sheet is rolled by a pair of rollers to obtain a compacted 2.3g / cm 3 Positive pole piece, the thickness of the pole piece is 146 μ m (thickness of aluminum foil is 16 μ m) at this moment, stand-by.

[0067] Negative electrode ratio: 958.5 negative electrode active material + 5.4g SBR (solid content 50%) + 3.6g CMC + 2g Super_p; using ...

Embodiment 2

[0074] Example 2 Preparation of 18650 type ternary cathode material battery

[0075] Positive electrode ratio: 991g of ternary positive electrode material + 5g of PVDF (5130) + 2g of Super_p + 2g of KS_6; using a pulper, first add 550g of NMP, then add 5g of PVDF (5130) and stir at high speed for 3 hours , 2g of Super_p and 2g of KS_6 were stirred at high speed for 3h, and 991g of ternary cathode material was stirred at high speed for 4h.

[0076] The stirred positive electrode slurry is coated on a coating machine to obtain a density of 173g / m on one side 2 , double-sided density 345g / m 2 positive pole piece. The above-mentioned coated positive electrode sheet is rolled by a pair of rollers to obtain a compacted 3.55g / cm 3Positive pole piece, the thickness of the pole piece at this moment is 106 μ m (the thickness of aluminum foil is 16 μ m), stand-by.

[0077] Negative electrode ratio: 958.5g of negative electrode active material + 5.4g of SBR (solid content 50%) + 3.6g ...

Embodiment 3

[0085] Example 3 Preparation of 18650 type lithium manganate cathode material battery

[0086] Positive electrode ratio: 945g of lithium manganate + 7g of PVDF (5130) + 2g of Super_p + 2g of KS_6; using a pulper, first add NMP with a total weight of 600g of positive electrode powder, and then add 7g of PVDF (5130) in turn High-speed stirring for 3h, 2g of Super_p and 2g of KS_6 high-speed stirring for 3h, 945g of LiFePO 4 Stir at high speed for 4h.

[0087] The stirred positive electrode slurry is coated on a coating machine to obtain a density of 212g / m on one side 2 , double-sided density 423g / m 2 positive pole piece. The above-mentioned coated positive electrode sheet is rolled by a pair of rollers to obtain a compacted 3.1g / cm 3 The positive pole piece, the thickness of the pole piece at this time is 152 μm (the thickness of the aluminum foil is 16 μm), stand-by.

[0088] Negative electrode ratio: 958.5g of negative electrode active material + 5.4g of SBR (solid conte...

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Abstract

The invention relates to a laminated cylindrical lithium ion battery and a fabrication method thereof. In the structure, the battery comprises a battery anode end cover, a battery cell and a battery case, wherein the battery cell is composed of an anode lug, an anode parallel leading tape, an insulation protectivesleeve, a cathode welding leading piece, cathode pole pieces, an anode pole piece and diaphragms, the cathode pole pieces are curved and folded in snake shapes, the diaphragms wrap the front sides and the back sides of the cathode pole pieces, two layers of diaphragms are arranged between the two layers of adjacent cathode pole pieces, and a layer of anode pole piece is inserted between the two layers of diaphragms. With the adoption of the laminated battery cell structure, a hollow region inside the battery cell in the prior art is eliminated, the capacity of the battery case in the same specification to the battery cell is improved, and the overall capacity of the battery is further improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, relates to a lithium ion battery structure, in particular to a structure of a cylindrical lithium ion battery cell and a manufacturing method thereof. technical background [0002] With the continuous advancement of the era of information electrification, all kinds of mobile electrical equipment are more and more widely used in people's daily life. At the same time, people's awareness of environmental protection is constantly improving. be the key. Lithium-ion battery is the product of the high technology of the times, because of its high specific capacity, high voltage, safety, reliability, green environmental protection and other performances, it has become a representative of modern high-performance batteries. Existing cylindrical lithium-ion batteries are mainly assembled from coiled electric cores and cylindrical steel shells. Among them, the battery cell is formed by winding a positiv...

Claims

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Application Information

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IPC IPC(8): H01M10/058
CPCH01M10/0525H01M10/0583Y02E60/10Y02P70/50
Inventor 纪继坤郅晓科梁广川
Owner HEBEI UNIV OF TECH
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